// Problem: 
// Contest: 
// URL: 
// Memory Limit: 
// Time Limit: 
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#include<bits/stdc++.h>
using namespace std;
#define int long long
inline int read(){
	int s=0,w=1;
	char ch=getchar();
	while(ch<'0'||ch>'9'){if(ch=='-')w=-1;ch=getchar();}
	while(ch>='0'&&ch<='9') s=s*10+ch-'0',ch=getchar();
	return s*w;
}
double lcm(int x,int y)
{
	return x*y/__gcd(x,y);
}
signed main()
{
	int t=1;
//	cin>>t;
	while(t--)
	{
		for(int i=1;i<=1e4;i++)for(int j=1;j<=1e4;j++){
			int x=343720*i*2,y=233333*j*2;
			if(17*x==15*y){
				cout<<fixed<<setprecision(2)<<sqrt((double)x*x+y*y);
				return 0;
			}
		}
	}
	return 0;
}
